Control music in a business / theater / presentation
Control music in a business / theater / presentation:
1 click: next track
2 click: previous track
hold click: if(sound==100%) then sound goes down 50% else sound goes up 100%
P.S. for android you can almost do this using for hold click the option mute, toggle, media sound (but this will put sound 100% or sound 0%). The set volume level 5 and level 10, do not work, since you only can set a static number. My workaround at the moment is using set level 5 (wait 30 seconds) and set level 10 again.

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Croitoriu Alexandru commented
I support this idea but I want to add to it !
I'm a magician and I have a set up with 4 blootooth speakers interconnected and I play music from Spotify (not only music but sound effects too). I control the music with the button from inside my shoes so to be more in control of what I play it would be nice to have :
-next
-previos
-play
-stop
-back from a playlist ,go down and up to select another playlist and click on it.
I know that is asking alot but maybi u can find a solution to be in total control of the music from maximum 4 buttons , it would make my surround sistem absolutely magical and the effect from people wen they don't know how it's done it's like one of the best and clean kind of magic u can do.
Thanks :) -
Carlos Abrantes commented
Another idea to accomplish hold click would be to have the option of changing from "Normal" mode to "Vibrating" mode on Android. This way it would be possible to set up the media level 10 on "Normal" mode and media level 5 on "Vibrate" mode.